Multiple-cylinder compression pump



l. R. PRICE. MULTIPLE CYLINDER COMPEESSION PUMP. APPLICATION msu rimzl. |920.

1,41 3,933. Patented Apr. 25, 1922.

A 2 snEEs'-sur i.

I v I jf/eases z l v E [ijn/n or j (jm cfa/zn ZI'LcG) J. R. PRICE.

MULTIPLE CYLINDER COMPRESSION PUMP. APPLICATION msn ma. 21,. 1920.

1,413,933. Patented Apr# 25, 1922.

2 SHEETS-SHEET 2.

JOHN R; PRICE, OF CHARLOTTESVILE; VIRGINIA, ASSIGNOR TODE'ELOPMENT NTDY FINANCE COMPANY NEVV'YORQI OFLNEW YORK, N. Y.- A CORPORATION 0F NEW To all w hom if may concern Be it known that Jol-IN R. Pinon, 'a citizen of the United States, residing` in Charlottesville, in the county-oit Albemarle and i State oli- Virginia, have invented certain new and useful lmprovementsfin Multiple-Cylindeicmpression Pumps, of which the tollowing is a specification.l

vMy present invention relates to an improvement in multiple cylinder compression' pumps,l the pump being operated'by the eX-r plosive cycle ot a multiple cylinder internal combustion engine, such for instance, as the well-known automobile type.A

One advantage oit pump is thatit is entirely automatic, simple as to its parts,

efficient in service, easy to assembleA and disassemble, and capable of withstanding hard use fv Another-advantage is'that it may be `used on internal combustion engines having a large -or small bore andstroke, and" it will operate as eiiiciently on small-boresmallsti-oke low power engine, as on a so-calle'd long-stroke high-pressure typ'e,fand without any adjustment whatever of either the engine or my pump.

.Aj particular yfeature of niy invention is the use ofladjacent .cylinders havingv space for communication betweenthe cylinder in.-l Y

teriors, and each cylinder having aplunger therein and means a 'i )ui-tenant to said s )aceV and loperatively connected tothe plungers 'for providingconcuireiit'movement of the plungers by movement ot eitheione of the plun! n A p n n f ingll0 having` a partitioning Wall l1 between the-cylinders with' space therein to receive' Oers. f h i In the present embodiment oli my invention this concurrent movement is producedg by racks operatively connectedy to' the plungers, afracl'tor each plunger, and a pinion nected toa multiple cylinder eiigineand con nected to anair tank. j V:k

four cycle? engine. Y.

i alumina-CYLINDER ooniennssioiv rUM-r. f

Specification of Letters Patent. Patented Ap132i5, Application ined February-21, 192,0. serial no. 369,391. 'l

Fig. 2, is a trontvelevation of my pump.V

Fig. 3, is avsectional view on the line l' of Fig. 2. Y

Fig; .bis ,a sectional View on the linev 4er-4L of Fig; v'3,'two vof the piston .or plunger heads being shown in' full, and' one partly broken away, and one in section, and the-lower or,

valve end of my pump being shown in se'cmentioned.

Figure 5, is afbottoin plan viewA of the valves of my pump.

Figure 6, is a plan, view o'l the valveprohai'fiiig therein a pistonV or plunger gener ally denoted b'y vB,'each"piston or vplunger `tion onthe line -m of Fig. 5,l nextbelow n cage comprising` theA air intake andr outlet being provided vwith a'pressure piston-headf `C and an *air con'ipression'v piston-head1),v

having 'between' the respective piston-heads a rack E.; the pinion FA located in the cylinder ypartitioning wallv and coacting wither 1 engagingreach of the racks '11; and the-cageY G comprising the air intaleva'lves'and air outlet valves.

Thefcyliiiders A A are shown connected tof*k l l amultiple cylinder internal combustion en180 V gine'generally denoted by M, either two or tour'cycle, .and preferably a yfour cylinder The cylinders A.l are provided with a casthel pinion F. vThe cover cap 12 forthe cylindeis A .is'reniovably secured to the cylin#` ders in any suitable manner, as by the bolts "lf They cover cap 12 has therein threaded, or otherwise suitably arranged, 'apertures or Y holes leandll, an aperture 'for each vkcylinf der, for attachingnieans, such as theducts- 14h and 14C, for connecting the' pumpcylinders tothe engine cylinders, whereby explosion'pressuie is permitted to enter the .actuation chainbersor spaces ot the pump cylin- Each of the pistons or plungers B comprises the bolt, generally denoted by 15, provided with the removable head or nut- 16, the stem 17, the bottom or stop plate 18, the pres` sure piston-head C, and air compression piston-head D.

Each pressure pistoirhead C preferably consists of three disks, shown in `F ig. 4, that is, two upper disks 19, and an under disk 20. The disks 19 and the disk 2O are alike in having an aperture therethrough for receiving the stem 17 of the bolt .15, but the disks 19 are each provided with an annular recess 21 for piston rings, while the disk 20 is provided with an annular recess 22 for receiving a lubricating means or swab, which rings and lubricating means are later described.

Each of the air compression piston-heads D preferably consists of two disks 23 and 24, an upper and an under disk, the disks 23 and 24 each having an aperture therethrough for receiving the stem 17 of the bolt 15. The disk 23 has an annular recess 25 .tor receiving lubricating means or swab, while the under disk 24 is provided with annular recesses 26 for receiving` piston rings similar to those ot' the disks 19, the lubricating means of thedisk 23 differing from that ofA the disk 29 and being later described. But l do not restrict myself to pressure piston-heads or air compression piston-heads composed ci separate disks, as such heads may be of one piece Yform arranged to receive the piston rings and lubricating means,`the' disk construction, however, being preferable as facilitating the manufacture and assembling ot my device.

Each rack E is a cylindrical member, in cross-section, provided on its exterior with convolutions'or annular teeth 27 and providedwith a central bore to receive the stem 17 of the bolt 15. f

The pinion F is located in the Vpartition Wall 11in an yopening 2S therein, and is loosely mounted on a shaft or bolt 29, which passes throi'lgh the cover or plate 30 removably bolted or suitably attached to the pump cylinder front walls, the shaft 29 then passing through thefpump cylinder front VWall substantially in the line Vof the partition wall and across the opening 28 thereof andV into the pump cylinder rear wall. The pinion l? is held in place by the stop collar 31, of the shait 29, and by the bushing` 32 which .occupies a space 33 provided in the pump cylinder front wall and partition wall, the bushing being or suitable fibre or any suitable bearing metal, the space 33 occupied by the bushing` 32 being oisuilicient size to ,aermit insertion or removal therethrough of the pinion F and stop collar 31. and the cover or plate 30, having a hole therethrough for the shaft 29, also providing a cover for the bushing. The pinion F is arranged on the shaft 29 to coact With or engage adjacent racks E when the parts are in operative relation, the teeth of the pinion engaging the convolutions or teeth 27 of each rack. rThe use of convolutions or annular teeth, such as 27, in cooperation with a pinion such as F, permits rotation of the rplungers B in the cylinders in operation,

tending to preserve theinterior of the cylinders.

The valvecage G is provided with air intake valves 34, preferably two air intake valves for each pump cylinder, these valves being of the usual` construction and springactuated in a known manner, and intended to admit air into the compression chamber or space of the pump cylinders. VThe valve cage Gr is provided with exhaust valves 35, preferably one exhaust valve for each pump cylinder, each exhaust valve 35 openingto a duct 36, which ducts 36 of the exhaust valves open to a common exhaust outlet 37 arranged for connection to a pipe or conduit 38, or other suitable means, for conveying compressed air from either of the pump cylinders to a receiver' such as the tank 39, Fig. 1. The cover plate 40, Fig. 6, is provided to hold the coacting Valve-operating.

springs 41 in operative position, and preferably is provided with four groups of air inlet openings 42, a group for each air intake valve 34, to protect the air intake valves. The cover plate 40 and the `valve cage Gr are secured to the bottom of the pump cylinders by any suitable removable means, such as the bolts 43.

ln assembling my device: Each piston or plunger B is first assembled outside of its cylinder A. The head of nut 16 of the bolt 15 is removed and an under disk 24 of the compression piston-head 'D is passed. over vthe:4 stem 17 and down against the stop plate18, the rings 44, which are of the split-ring type` being` rst located in the recesses 26 V by pressing them upwardly and downwardly, as the case may be, into the recesses 26, thus avoiding all danger of breaking the rings.I as wouldV arise were it necessary to spring. the rings over the greatest diameter of Lthe disk and then locate the rings in recesses,vas is customary, an advantage of my disk con- ,truction oit the piston-heads thus being ob-V vious. f Y Y The upper disk 23 is passed over the stem 17 and down against the under disk 24, the lubricating meansV or swab 45v being first located in the recess 25.

The lubricating meansl or swab 45 is preferably of fibrous .materiah Yor any material adapted to retain and distribute oil in a swabbing manuel on the pump cylinder interior wall. The rack E is passed over the stem 17 and down against the disk 23. An under disk 20 of the pressure piston head C is passed over the stem 17 and down against head Q are then passed over the stem 17, 1,0:

c the topV of vthe pump cylinders, the valveA the rack Eythe lubricating means` or swab.y

4S being first located in the recess 25,A the lubricatingv means in this case being a heatreSi'sting, flexible metal or material, such as brass tinsel, adapted to retain and distributeV oil in a" swabbing manner on the pump cylindr interior Wall. y .Y The upper disks 19 of the pressure pistonfor convenience in construction, and'dmvn against the upper end of the rack E, the pis-k ton rings 44 being first located in the recesses 21. The head or nut 16; is screwed down' upon the stem 17 'upon the parts and an assembled piston or plunger is provided. A further, advantage of the pressure piston*- head and air compression piston-head com-VA posed of disks is Aobvious from theabove description of assembling. A

A piston or plunger B thus assembled is inserted in each `of the pump cylinders A, either from the bottom vof the cylinders, the

valve cage G and bottom plate not yetbeing in place and the `topr cover plate 12 being. in place, or, if more convenient, the piston or plunger B maybe insertedfrom cage G and bottom plate40 being in place, and thetop'coverV plate 12 not'being in place, andthe valve cageand bottom plate, or the topcover plateJ asthe case may be, is then secured to they pump cylinders.

the pump cylinders, the journal bolt orshaft 29 ofwthe pinion ispasse'd through the opening4 33 for the bushing v32,and across the opening 28 in the partition Wall 11 and seated inthe pump lcylinder rear Wall in a suitable recess therefor. lThe sto-pA collar 31 is passed with, the sha-ftv 29 inwardly and against the pump cylinder rear interior Wall,

' the openingin the'partitionyvallpermitting f and bushing 32, or suitable plugs, not shown,

may be provided in the pump cylinder Walls forA introducing oil, the oil when introduced -in-to the pump cylinder interiors being distributed by the reciprocal movement ofthe racks E and rotation of the pinion F.

In operation: Assuming thatthe iiring order' of the *four cylinders ofthe engine, F ig. 1, maybe either ofthe 1-3-4-2, or'VV that it' may be of the1-'2--i-,3 forder, it

is desirable., as found in practice` to tao the intermediate cylinders 1K and L of the engine with duct memberssuch'as 14h: and*r 14C which are connected to respective-pump K n To insert` the pinion F and its supporting parts intol pump cylinder `front vvention or exceeding cylinders. If' explosionoccurs during the Y normal running of thegas engine. or motor in cylinder K, then. thatvpiston or plunger,"

of the. pump cylinder connected tothe. duct 14S" from the cylinder` K is forced down- Wardly about asshown in Fig` 4,1and the air originally in the air. compression chamber or space of such pump cylinder'l is expelled through the duct leading"Y tothe air tank.. It is obvious that if the engine, Fig.

1, is'runningcn the 1'T3T4f12fsequence, of f explosion, the cylinders `K and L Will never re together, but Willy iire alternatelyuan-d cylinder "K Will fire and cylinder .L will syphon simultaneously andin thenex-t positionthe reverse of this will be true.A v4-'l"heforegoing also applies to ,enginesl running on the sequenc'efand. that evenin this ysequence Y'the cylinders and' L Will alternately. When this alternate tiring.v o`c` curs, the high pressure generated in that cyl-I f inder K or L which is in connection With'its f i i respective pressure chamber or space ofthe pump cylinder .'Will cause the respectivev plunger'or piston of the `fpump to.y operate' downwardly byy reason 1 of' such explosion transmitted through the ducts 14DV orlic, as

the case may be, andthat alternate eX-j plosions in the cylinders K `and L will alternately .operate .to' cause l one piston vor;Y plunger of. the pump to 'movedovvnvvardly and the opposite piston o-r plunger to move upwardly through the action-of the pinion F and racks It Will thus be seen that the alter-nate high pressures lin the cylinders" K `and L will. opera.tethe pistons B Vfor an compressed will be forced into the air tank until a sufficient volume andV pressure has been introduced.

Y air compression stroke,'and that lthe air'thus Should either of. thei'cylinders Kwand-'Lv-V misiire, or shouldv there bea Weak explosive.

mixture, "the respectivel pistons or plungers l B will operatel to Vthe extent of the power introduced thereto, and no harmcanbe doneV to the pump by any laclr'ofcycie orincre'ase of explosive press-ureY transmitted.

Having thus described my invention,it J

should be understood that there mayA be".lr f

in odiiications thereof"v and g varia-tions'therein;V

without departing from, the spirit of the in-l pended claims.

Having claim: Y

1. A; pressure actuatedpump VVcomprising i thusy described' my invention, I

Hthe, Scope of the ap-A 'i cylindersfmeans for connecting the cylinders f to each other having space therein providing y.

communication betweenjv the cylinder rinteriors,apzungerin eachcylinder movable in plungers'jfor providing, Awhen eitherV of thev vonedirection by directfp're'ssureandvfree'from VreciprocationI byA :direct pressure in Vthe. opi` posite direction',j yand means operatively oc n 1? Y lcu'pying' said space and vcoacting with the fo ,f

plungers is moved by direct pressure, concurrent movement oi" the other plunger to position for movement by direct pressure.

2. .A pressure actuated pumpcomprising adjoining cylinders, means l'or connecting other, means for connecting the cylinders tov each other having space therein providing communication betweenl the cylinder interiors, a plunger in each cylinder movable in one direction by direct pressure and free from reciprocatioii by direct pressure in the opposite direction, and means operatively occupying said space and coacting with the plungers for providing, when either of the plungers is moved by direct pressure, concurrent movement of the other plunger ink direction opposite to the movement of the first plunger' to position 1for movement by direct pressure.

4. A pressure actuated pump comprising cylinders, means for connecting the cylinders to each other having space therein providing communication between the cylinder interiors, a plunger in each cylinder having a rack portion, the plunger being movable in one direction rby direct pressure and free from reciprocation by direct pressure in the opposite direction, and a pinion operatively occupying said space and engaging the rack portions of the plungers for providing, when either plunger is moved by direct pressure, concurrent movement of the other plunger to position i'or movement by direct pressure.

5. Apressure actuated pump comprising l cylinders, means for connecting the cylins ders to each other having space therein providing communication between the cylinderV interiors, a floating plunger in each cylinder provided with a raclr portion having annular teeth, the plunger being movable in one direction by direct pressure and free Jfrom reciprocation by direct pressure in the opposite directipn, and a pinion operatively occupying said space and engaging the annular teeth of the rack portions ot the plunger .for providing, when either of the plungers -is moved by direct' pressure, concurrent movement of the .other plunger to position for movement by-direct pressure.

6. A pressure actuated pump comprising cylinders, means for connecting the cylinders to each other havingspacetherein providing communication between the cylinder inten riors, a plunger in each cylinder movable in one direction by direct pressure and free from reciprocation by direct pressure in the opposite direction, means operatively occu` aying said space and coacting with the plun- I Y cylinder provided with an actuation headl and a pump head, theplunger being movable in onedirection by direct pressure on the actuation head and being free from reciprocation by direct pressure in'. the opposite direction on the pump head,` means operativelyoccupying said space and eoacting with the plungers for providing when either ci" the plungers is moved direct pressure,

concurrent movement or the other plungerV to position for movement byv direct pressuie,x

and means for exerting initial direct 'pressure on the actuation head of either of the plungers and subsequently exertingdirect pressure on the actuation head of each plun- .ger alternately.

8. A pressure actuated pump comprising, with means for supplying pressure, adjoining cylinders,v means Ytor connecting `the cylinders to each other having space therein providing communication between the cylvinder interiors, means for connecting the cylinder interiors to said pressure supplying means, a plunger in each cylinder movable in one direction by direct pressure from said pressure supplying means. and tree from recipiocation by direct pressure inthe opposite direction, and means operatively occupying said space and coacting with the plungers for providing, when either Vofthe plungers is moved by direct pressure from said pressure supplying means, concurrent movement or the otherplunger to positionV for movement by direct pressure from lsaid means.

9. A pressure actuated pump comprising adjoining cylinders, means orfconnecting the cylinders to each other having` space therein providing communication ybetween the cylinder interiors, aplunger in each cylinder movable in one direction Vbyldirect means operatively occupying said space and pressure and free from reciproeation by Vdiy Vrect pressure in the opposite direction,

preeeure and free frorhfreoiproeatiori by direct pressure in th'e- 'opposite direction, ineens opertively 'occupying said sp'zice Vand eoeoting with the `piunggers for providing, when either of ,the plungers is moved by 'directv pressure, Vceneurrerit movement orf the other 'plunger to position for movement by direct pressure, and means for introducingl lubricant in to one cylinder, lthe'lubricant being introduced. from seid cylinder into the adjoining cylinder through said coininunieating space and being distributed by seid coecting means and 4by the plungers, Y 11.y A'lprssure producing pump having adjoining cylinders and 'z'idapt'ed to be brought into fluid pressure zictuitingconnec tion with a 'fluid pressure engine; ineens for` separating th'e' Vvpinnp cylinder interiors having space therein for communication beg` tween theeylinderinteriors; ineens for iii;v trodicin'g lubricant into the cylinders; a double-heeded piungerpiston for each tyiinder, having Ven annulery rack-'gear' between the -tvvo piston'heeds or -eaeh cylinder; an idler'geaJr-Wheel in the spe/ce communicating with the two cylindersend coe'cting with the rackegear of both plungers, for providing concurrent movementof-tlie plunger. pistons by movement of either one ofsuch pistons; und meins for uiteimtttelyy moving the bricnt for the cylinders und mechanism'.

12. Al pressure producing punip htving adjoining cylinders', means for seperzttingthe cylinder Vinteriors having space therein for comin-imitation between the cylinder inteirio'sgplunger in each cylinder vprovided with en upper and al.' lower Vpistonhe-d`;

cylinder bfe'tt'veen seid piston-heads; lI iietin's opertively occupying 'seid space' and 'cc'iict-y in-g with the pluiig'ers for providing concur# rent rrioveiiient or thefpiungers by movement of veither of the piungere end for moving the plungers; said plungers end sttid meeting ineens providingr'iietuis for' distribution of the lubricant. Y

' i3; In a', pressure produeirrg "pump, iriooui` e5 bine'tion, adjoining cylinders; ineens for adjoining cylinders, ineens .for 'connecting cylinderY iiiovtibie'iri oireuiree'tien by direct der pressure.

plungers, seid plungers end seid c'otic'ting"` me'ns providing nien's for distributing lu` means 'for introducing lubricant iiit eachcylinder vinteriors liftviiig a spce, therein for for ,one plunger the 'ou 'the other free Vinimlveclginlets, 'one for euch separating the A"cylinder interiors 4hfivi'iig space therein for communication between the f cylinder interiors; 'a *plunger in each cylinder having ruck vIneens appurtenant thereto; e I

pinion occupying seid'spi'ce land engaging 70 seid rack means Afor providingconcurrent Y movement of 'the 'plungers by movement or either vone ofthe plungersyti` `shaft fOr/Seid l pinion, i the cylinders havingi en reopening therein lor introduction oifsuidf'pinion und 'f5 shaft into=saidvspace 'y and for providingy ineens :for introducing lubricant into' the i cyl-j inders; `ineens Jfor securing the inner end or saidshaft to .the cylinders; it `ren'i'ovible" bushing for the outer endof 'said shftge removablev cover ,for seid 'opening Vproviding ineens for securingV thev outer 'end of Vsaid shaft; und' Ineens Jfor ni'oving the "plungers.'r

14;' A fluid pressure pump 'comprising-edi' joining cylinders';-niens forsepurti'ng the cylinder interiors having zt space therein for communication b'etivee'ntli'e cylinderiiii f teriors';"a plunger for each cylinder; ineens opera-tively occupying said space and c'octingyviththe plungers for p'rdviding'-"cfonv current'inovernent or the plungers b'yj'invement offeither one for the plungers; and'rlni'd vpreseure,i'niets-fone for ettoh oylihder'etthoj adjacent ends ofthe-cylinders, whereby' one cylinder may' be broughtinto conirrii'iniczition T'With-onecylinder, zind"tlief otlie`r ivith nnothe'r cylinder 'or in internzil coiribiisti'on engine or motor, ivhich are tilterii'gtely 4iiiil5'.v A 'fluid pressure piinip coin-prising eidjoining cylinders; ineens "for seprattig the cylinder interiors bevind spficether'ein 'for i coniinunicatin'gbetvveeii the 'cylinder inter-ii'V ors; a plu'ngror each cylinderprovided withv a ruck-gear having anni'ilirteth; pinion'V 1'05 o'peritively `occupying selid s'piice in ine'sh oii on'e side vvith the annuler teeth of one plunger indou the other with those lor Vthe othei plunger; Eind luid' ,pressiire iiilets'one'f'or ezichcylinder et the zidjnce'nt ends or the 110 cylinders, whereby one cylinder nitty" be',

brought into coihrnuni'ction with' one imot'or' Y Cyiihder, mi the` other with another motor cylinder 'or "an interntl combustion engine' 1 or inot'or which alternately "delivers'fluid'115 iii'dividu'lly, one toorie'cylinder rind the other tdthe other cylinder.rv f 16. A fluid pressure Vpuiifi'pl` coinprisiiig tid-j i jdinin'g eylinders`rneans fory sepratiiig "thec'oin'iunioting' between the cylinderin ril ore; erpiiiuger for-earth eyhriuer prot i with druckt-'gear' lie-ving' zi-iiiiiil-i teet if: piiiih oprtiife'ly o'cc-iipyiirgfseid -spce ii Inesh on 'one sfide (voith the annule-r 'teet 1 tho/se of the otlie plunger; fluidpressiley indr at the aldjceiit ends or' the inde whereby one cylinder be broughif iiitpi roofree communication rwith one cylinder, and the other with another cylinder` ot an internal combustionengine or motor, which cylinders are alternately under pressure.

17. A fluid pressure pump of the class described, comprising a double cylinder integrally formed casing or housing, having an opening in the-central wall dividing the cylinders; a double headed piston plunger reciprocatingly mounted inl each cylinder, having a rack-gear between the pistonlheads; and a gear-pinion revolubly carried in the opening in the central wall in mesh with the rack-gear of eachk of the piston plungers.

18. A fluid pressure pump of the class described, comprising a double cylinder integrally formed casing orkhousing, .having lan opening in the central wall dividing/the cylinders; a double headed piston-plunger reciprocatingly mounted in each cylinder, having Van integrally formed annular peripheral rack-gear between the piston heads; and a gear-pinion revolubly carried Vthe opening in the central wall in mesh with the rack-gear of each of the piston-plungers; means vfor air intake tor the compression of the air; and means for outlet ot the com- Vpressed air located at the same end ot the two cylinders; and means at the opposite end of the cylinders for bringing the actuating piston-heads at such ends into free communication with two alternately acting sources of duid pressure. K Y

19. A uid pressure pump of the class described, comprising adouble cylinder integrallyformed casing or housing, havingr an opening in the icentral wall dividing'the cylinders; a double headed piston-plunger reciprocatingly mounted in each cylinder, carrying a raclegear between the piston heads; and a gear pinion revolubly carried in the opening in the centralwall in mesh with the raclegear Aof each of the piston.

plungers; means for air intake for the compression of the air; and means `for outlet oir the compressed air located at the sameeinl or the two cylinders; and means located at the opposite end of vthe cylinders -For brirm-- ing the actuating pistoirheads at such endsl into tree communication with two alter.-

nately acting sources of fluid pressure.

AV20. Ailuid pressure pump of theclass described, comprising a double c rvlinder integrally formed casing or housing, having an opening in the central wall dividing the cylinders; a double Yheaded piston-plunger reciprocatingly mounted in each cylinder, carrying a rack-gear Abetween the piston-- heads; a 'gear-pinion revolubly carried in the opening of the piston-plungers; means for air intake for compression of the air; means for outlet of the-compressed air; and

means located at the opposite end of .thek

cylinders for bringing the actuating pistonheads at such ends into free communication with two alternately acting sources Vof liuid pressure and exhaust. l j

2l. ln combination, adjacently' relative cylinders; meansl for connecting the cylinders having space therein providing .communication between the cylinder interiors; ailoating piston-plunger-in each cylinder means operatively occupying said spaceand cooperating with the piston-plungersiior providing` concurrent movement of thep'is- 'tonfplungers by movement of either one of the piston-plungers; and means for moving the piston-plungers; saidl piston-plungers and said coacting means being adapted forV permitting rotary movement. of the Y pistonplungers linthe cylinders. 22. In combination,` adjacently related cylinders; means for connecting thefcylin-y ders having space "therein providing communication `between the cylinder interiors; a floating plunger in each cylinder having compression heads anda connecting stem, thestem having annular teeth thereon; .a pinion operatively occupying said space andE engaging the annular teeth' of eachfofthe plunger stems for `providing .con-current movement of the kplungers by movement -o either one of the plungers;v and-meansfor moving1 the plungers. Y.

23. In combination, adjacentlyv related cylindersgrfmeans for connecting the'cylinders having space therein providing conrmunication between the cylinder interiorsga ioating plunger in each Vcylinder 'having' 100 compression heads and a connecting stem, the stem havingannular teeth formed there?v on; a pinion operatively occupying said spare and engaging the annular teethoff each, oi the plunger stems for providing concur-f rent movement of the plungers by movement oi either one of the plungers; and means tor moving` the plungers. Y

24;. ln a pressure producing- "pump, in combination, adjacently related eyl;inders*;p1.10 means for connecting the kcylinders having space therein *providing communication between the cylinderinteriors; a double head ed plunger in eaclifcvlinder; means'operatively occupying said spaceand ceac-ting with the plungersr for providing concurrentmovementV of the plungers by movementof either one of the plungers;l acage provided with a plurality of fluid intake Vmeans `for the cylinders, said intake` means comm-uni eating with and being equally distributed to the cylinders; said cage being provided with means communicating with each Vcylinder for outlet of compressed fluid therefrom;V

and means for alternately moving the,` plum-125i der interiors; a double headed plunger in each cylinder; .means operatively occupying said space and coacting with the plungers for providing concurrent movement of the plungers by movement of either one of they plungeis; a cage providedrivith a plurality of luid intake val-ves, said intake valves communicating with and being equally distributed tof the cylinders; said cage being provided with means communicating Witlil()v means for alternately movingthe plunger-3.YY 'Y lJHN RPRICE. y [L s] Witnesses:

WV. R. SHEPHERD, Y W. R. Mon'roN.- j 

